Landing pull request [337](https://github.com/jquery/jquery/pull/337). Value of radio inputs resets when type is set after the value in all IEs. Fixes #8570 ([bug](http://bugs.jquery.com/ticket/8570)).

Makes sure no unload handler is bound when not in IE. Also simplifies the whole "on unload abort" code. Also avoids the declaration of yet another variables in the jQuery main closure for the temporary XHR used to assess support properties.